Liquid Stabilized 445

[villalaser]

Yup thats right, liquid stabilized!

Well its all in a Cree Aurora host, A104 doide in a direct press aluminum heat sink. I used a micro flexdrive set to I think 1.1A(was going for max). I might need to make a new test load, the one I have now has ben used for 445 curents and smells when I use it for very long.

It draws 2.30A at the tail cap with a fresh battery. So it might be 1.5A im not shure, I did do my best to set it right at the max. Allso I only have a 1 watt LPM.:cryyy:

This is allso a testament to how durable these 445 diodes are. When I made the heat sink I made the diode pocket to deep and to tight around the can. (I was going for a tight fit but....)
I got to impatient from the thermal adhesive I used to seal the diode, And when I pressed the diode it bent the can and broke the glass lenss. You might be able to see it in the last pic.
I allso somehow connected the diode up backwards:crackup: and ran whatever current the flexdrive is at... But it still lives!

To the pictuer's

The Flexdrive is in its own pill that mounts to the back of the diode heatsink with a thermal adhesive. The pill has two hole's one for power wires and one is a fill hole for the mineral oil.

I used a hex screw covered in adhesive to plug the fill hole.

I forgot to take a pic of the back of the diode so you can get a beter idea of the volume.
But ill have some beam shots later

 

[bobhaha]

Cool, what liquid did you use? Mineral oil is what is used in most applications where the electronics are directly exposed to the liquid, is this what you used?

 

[johnmarsh]

yes this great and i really like this thanks for sharing

 

[hydguy]

Cool idea, does it stay cool?
No elect. issues with the oil ?
When I got my 445 I was scared to pick the diode up with my fingers due to all the posts here about esd. and how easy it is too cook one. And here you are drownding one.

 

[Meatball]

That poor diode! At least it ought to be thermally happy for now!

 

[AUTO XX]

I'm surprised it is "liquid proof" through the case insulated + and - diode pins
What did you use a mineral oil proof sealant?

 

[villalaser]

I'm surprised it is "liquid proof" through the case insulated + and - diode pins
What did you use a mineral oil proof sealant?

I Just used arctic alumina thermal adhesive.

Cool, what liquid did you use? Mineral oil is what is used in most applications where the electronics are directly exposed to the liquid, is this what you used?

Yup mineral oil.

Cool idea, does it stay cool?
No elect. issues with the oil ?
When I got my 445 I was scared to pick the diode up with my fingers due to all the posts here about esd. and how easy it is too cook one. And here you are drownding one.

It heats up a lot slower than I thought it would. I think I did good buy sandwiching tha driver pill between the heatsink and the old driver pill, the host heats up more all at once. Plus the extra mass of the mineral oil.
I realy wish I had a beter LPM so i could see how stable it is.

Something cool I just noticed next to my A103 diode labby, the pointer is a noticeably lighter blue:yh:

Got some good beams

 

[JLSE]

Wouldnt the oil act as an insulator here?

Its not being pumped out, so it would absorb
the heat and then what?

Dont get me wrong, its a cool idea, just not sure if
oil in lieu of the metal may benefit more..

 

[villalaser]

Wouldnt the oil act as an insulator here?

Its not being pumped out, so it would absorb
the heat and then what?

Dont get me wrong, its a cool idea, just not sure if
oil in lieu of the metal may benefit more..

My thoght was more thermal mass. Also to move heat from the back of the diode and areas of the driver that dont tuch the heat sink.
Its beter than empty void of air.

 

[anselm]

Congrats! Great idea, well executed too
Oil sure is 100x better than air to absorb and transfer the heat.
Just your standard 15W40 engine-oil?
And lets hope you don't need to mess with it anytime soon (yuck).

Now to see if the seal works well enough.

Wouldn't want no radiator leak in your pocketses.

 

[Cyparagon]

Its not being pumped out, so it would absorb
the heat and then what?

Convection.

 

[DrSid]

Wouldn't it expand when warmed ?

 

[anselm]

Sure, not very much though, it's not a gas.
It just gets thinner and flows better, might escape through gaps
that are tight when the oil is cold.

 

[Benm]

I have my doubts about the liquid cooling method, but this sounds interesting:

I allso somehow connected the diode up backwards:crackup: and ran whatever current the flexdrive is at... But it still lives!

Does anyone know what voltage those flexdrives provide when presented with an open circuit? It seems like these diodes are pretty proof to reverse polarity, which is always nice to know in case you somehow mix up the wires

 

[villalaser]

Dont get me wrong, its a cool idea, just not sure if
oil in lieu of the metal may benefit more..

The heat sink has more metal, from trying to enclose the diode and diriver.
I found two rejects and got a pic so you can see

Sure, not very much though, it's not a gas.
It just gets thinner and flows better, might escape through gaps
that are tight when the oil is cold.

What he said.


Mineral oil - Wikipedia, the free encyclopedia

 

[Limecat]

Disregard that. I can't into reading